springboot整合mybatis
1、导入 MyBatis 所需要的依赖
<dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.1.1</version></dependency>
2、配置数据库连接信息（不变）
spring: datasource: username: root password: 123456 #?serverTimezone=UTC解决时区的报错 url: jdbc:mysql://localhost:3306/springboot?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8 driver-class-name: com.mysql.cj.jdbc.Driver type: com.alibaba.druid.pool.DruidDataSource #Spring Boot 默认是不注入这些属性值的，需要自己绑定 #druid 数据源专有配置 initialSize: 5 minIdle: 5 maxActive: 20 maxWait: 60000 timeBetweenEvictionRunsMillis: 60000 minEvictableIdleTimeMillis: 300000 validationQuery: SELECT 1 FROM DUAL testWhileIdle: true testOnBorrow: false testOnReturn: false poolPreparedStatements: true #配置监控统计拦截的filters，stat:监控统计、log4j：日志记录、wall：防御sql注入 #如果允许时报错 java.lang.ClassNotFoundException: org.apache.log4j.Priority #则导入 log4j 依赖即可，Maven 地址：https://mvnrepository.com/artifact/log4j/log4j filters: stat,wall,log4j maxPoolPreparedStatementPerConnectionSize: 20 useGlobalDataSourceStat: true connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
3、测试数据库是否连接成功！
4、创建实体类，导入 Lombok！
Department.java
package com.kuang.pojo;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;@Data@NoArgsConstructor@AllArgsConstructorpublic class Department { private Integer id; private String departmentName;}
5、创建mapper目录以及对应的 Mapper 接口
DepartmentMapper.java
//@Mapper : 表示本类是一个 MyBatis 的 Mapper@Mapper@Repositorypublic interface DepartmentMapper { // 获取所有部门信息 List<Department> getDepartments(); // 通过id获得部门 Department getDepartment(Integer id);}
6、对应的Mapper映射文件
DepartmentMapper.xml
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.kuang.mapper.DepartmentMapper"> <select id="getDepartments" resultType="Department"> select * from department; </select> <select id="getDepartment" resultType="Department" parameterType="int"> select * from department where id = #{id}; </select></mapper>
7、maven配置资源过滤问题
<resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> <filtering>true</filtering> </resource></resources>
8、编写部门的 DepartmentController 进行测试！
@RestControllerpublic class DepartmentController { @Autowired DepartmentMapper departmentMapper; // 查询全部部门 @GetMapping("/getDepartments") public List<Department> getDepartments(){ return departmentMapper.getDepartments(); } // 查询全部部门 @GetMapping("/getDepartment/{id}") public Department getDepartment(@PathVariable("id") Integer id){ return departmentMapper.getDepartment(id); } }
启动项目访问进行测试！
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